| 摘要: |
| 为研究沥青在多次损伤条件下的愈合性能,采用动态剪切流变（DSR）仪中的时间扫描模式对沥青进行损伤愈合循环加载试验,以沥青愈合期间的复数模量恢复程度（即愈合指数）为愈合指标,分析了不同热氧老化程度下70#基质沥青与SBS改性沥青多次损伤愈合性能规律,并结合沥青傅里叶红外光谱(FTIR)试验,以特征官能团峰面积比定量分析了沥青功能基团的组成和含量对其自愈能力的影响.结果表明：沥青愈合指数随损伤愈合次数的增加而减小,首次损伤时沥青愈合指数减小程度最大.老化程度对沥青愈合指数影响显著,表现为老化程度越高愈合指数越小.SBS改性沥青多次损伤愈合和老化后的愈合性能均优于70#基质沥青，SBS改性剂可增强沥青的抗疲劳损伤能力和抗老化能力.沥青中大分子含量越高,分子扩散速率越慢,自愈能力越弱；轻长型分子含量越高，分子扩散速率越快,自愈能力越强. |
| 关键词: 道路工程 沥青 损伤愈合 动态剪切流变仪 傅里叶红外光谱 |
| DOI：103969/j.issn.1007 9629201904013 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51278513）;齐鲁交通发展集团养护科技项目（2018YHKY 01） |
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| Multiple Damage Healing Properties of Asphalts under Thermal Oxygenation |
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XIANG Hao1, ZHANG Wenwu2, LIU Peng2, LI Weijian1, HE Zhaoyi1
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1.School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China;2.Qilu Transportation Development Group Co., Ltd., Jinan 250101, China
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| Abstract: |
| In order to study the healing performance of asphalt under multiple damage conditions, the dynamic shear rheometer(DSR) time scanning mode was used to carry out damage healing cycle loading test. Recovery degree of complex modulus during healing was taken as healing index. Multiple damage healing properties of 70# matrix asphalt and SBS modified asphalt under different aging degrees were analyzed. Combined with Fourier infrared spectroscopy(FTIR), the influence of functional group composition and content on self healing ability was quantitatively analyzed. The results show that healing index decreased with the increase of the damage healing times. The healing index decreased the most when the first injury occurred. The degree of aging affected the healing index significantly. The higher the aging degree, the smaller the healing index. After multiple damage healing and aging, the healing performance of SBS modified asphalt is better than 70# matrix asphalt. SBS modifier can enhance the fatigue resistance and anti aging ability. The more macromolecular content, the slower the molecular diffusion rate and the self healing ability. The more lighter and longer molecular content, the faster the polymer diffusion rate, and the stronger the self healing ability. |
| Key words: road engineering asphalt damage healing dynamic shear rheometer(DSR) Fourier infrared spectroscopy(FTIR) |
